Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ef5b482f467891…

MALICIOUS

PDF

39.6 KB Created: 2020-11-04 09:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f47063c18df8acc6510ef4694d44574 SHA-1: c2b7893a80f73b409f1ff053268393e17e14417e SHA-256: 61ef5b482f4678912592a70197557fb861652b9cf2d33388865ba9384869e62c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, and another detected a large link farm pointing to external PDFs, suggesting a tactic to manipulate search engine results or redirect users to harmful sites. The document body, though heavily obfuscated, contains a URL that aligns with the detected malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/aws?keyword=meat+jun+sauce+recipe
    • https://dofuliral.weebly.com/uploads/1/3/4/3/134346813/ed0b74f9458f9.pdf
    • https://tibijipobarak.weebly.com/uploads/1/3/4/4/134493900/nubupiv.pdf
    • https://cdn-cms.f-static.net/uploads/4415065/normal_5f9ad72fcf7f8.pdf
    • https://cdn-cms.f-static.net/uploads/4376404/normal_5f905006d49f9.pdf
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/44d87feaf8ee.pdf
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f8ffe4eb296a.pdf
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/7628284.pdf
    • https://cdn-cms.f-static.net/uploads/4403822/normal_5fa0bf9abdda5.pdf
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5f912019427f5.pdf
    • https://cdn-cms.f-static.net/uploads/4404725/normal_5fa1e88459b5f.pdf
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f87200871a37.pdf
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f883ecc569a1.pdf
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/noromokubuti_rejinokusatopev_kozajaxufu.pdf
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f8932a48ac23.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d42.bin
8ae8e6a3db3e1904f9e30d069eb2c3a232fdc57d7174891fb678d293bc138e59
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D42 4976 bytes
font_01_sfnt_off00006e52.bin
31c2501b11922ce3f1da10d0681df89a35785ae432fb74bdce8ebc233c94cd28
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E52 10332 bytes